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On the determination of laminar flame speeds from stretched flames
Wu CK(吴承康); Law CK
Source PublicationProceedings of the 20th Symposium (International) on Combustion
Conference NameThe 20th Symposium (International) on Combustion
Conference Date1984
Conference PlaceBaltimore

The effects of stretch on the determination of the laminar flame speed are experimentally studied by using the positively-stretched stagnation flame and negatively-stretched bunsen flame, and by using lean and rich mixtures of methane, propane, butane, and hydrogen with air whose effective Lewis numbers are either greater or less than unity. Results demonstrate that flame speed determination can be influenced by stretch through two factors: (1) Preferential diffusion which tends to increase or decrease the flame temperature and burning rate depending on the effective Lewis number, and (2) Flow divergence which causes the flame speed to assume higher values when evaluated at the upstream boundary of the preheat zone instead of the reaction zone. Recent data on flame speed including the present ones are then examined from the unified viewpoint of flame stretch, leading to satisfactory resolution of the discrepancies between them. The present study also proposes a methodology of determining the laminar flame speeds by using the stagnation flame and linearly extrapolating the data to zero stretch rate.

Indexed ByEI
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GB/T 7714
Wu CK,Law CK. On the determination of laminar flame speeds from stretched flames[C]Proceedings of the 20th Symposium (International) on Combustion,1985:1941-1949.
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